Funny you should bring that up. My worst game I ever played in my life was in that very same line, only my opponent didn't miss the mate. Game over in 6 moves. Granted it was a blitz game and I had never seen Qe2 before, but it was still no excuse.

I say if the 1300 just divorced, had no sleep, was sick, unconcentrated because someone kept throwing sand at him, blindfolded and played a game of cards at the same time. The 2700 might just stand a chance of winning.Or the 1300 would just lose equally bad.

A friend told me that the ratings are set up so a 1000 player has a 1 in 10 chance of winning an 1100 player. So if this is correct a 1300 player would have a 1 in 100,000,000,000,000 chance. 1 in one hundred trillion. So your saying there is a chance! Also take into consideration that in playing that many games, which is not possible, your score would improve for sure.

I say if the 1300 just divorced, had no sleep, was sick, unconcentrated because someone kept throwing sand at him, blindfolded and played a game of cards at the same time. The 2700 might just stand a chance of winning.Or the 1300 would just lose equally bad.

I once played a player rated 1400 in a USCF-rated tournament game, blundered my Queen, ended up with King and three pawns vs King, Queen, and Bishop, and he offered me a draw when he had a forced checkmate available.

My biggest upset is beating a 2200 when I was rated 1280 or so (900+ points) in a rated tournament game.